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Which of the following gases would be the most and least ideal at 298 K and...

Which of the following gases would be the most and least ideal at 298 K and 1 atm. Explain.

Carbon monoxide gas, carbon dioxide gas, neon gas, ammonia vapor

Science   Advanced-Physics   
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Answer #1

We know that 1 mole of an ideal gas occupies a volume of 22.4 dm3.

Therefore if we know the densities of the gases at the given temperature and pressure, we can easily calculate the molar volume occupied by each of the gases.

Gas Density (gm/dm3) Molar mass (gm/mol) Molar volume (Molar mass/density)
CO2 1.842 44.01 23.89
CO 1.165 28.01 24.04
Ne 0.899 20.18 22.44
NH3 0.717 17.03 23.75

As we can clearly observe from the above table, the Molar volume of Neon is closest to the expected ideal gas value, followed by NH3 and then by CO2 and finally CO.

The stability goes as Ne>NH3>CO2>CO.

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